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City health officials said lab tests performed at the Centers for Disease Control and Prevention confirmed that the child does not have measles. Instead, the child had a reaction to the measles-mumps-rubella vaccine that she received earlier in the month.

"When we investigated the case, we were fairly certain that this was a false alarm," Baltimore City Health Commissioner Dr. Leana Wen said in a statement. "However, given that measles is one of the most contagious diseases in the world, and given the outbreak going on around the country, we took every precaution in case this child turned out to have measles."

There has not been a documented case of measles in Baltimore City in at least the last decade. Baltimore has high vaccination rates, with nearly 99 percent of public school children being vaccinated, health officials said.